The Effect of Paper on the Detection Limit of Paper-Based Potentiometric Chloride Sensors.
Anal Chem
; 94(43): 14898-14905, 2022 11 01.
Article
em En
| MEDLINE
| ID: mdl-36260770
ABSTRACT
While paper is an excellent material for use in many other portable sensors, potentiometric paper-based sensors have been reported to perform worse than conventional rod-shaped electrodes, in particular in view of limits of detection (LODs). Reported here is an in-depth study of the lower LOD for Cl- measurements with paper-based devices comprising AgCl/Ag transducers. Contamination by Cl- from two commonly used device materialsâa AgCl/Ag ink and so-called ashless filter paperâwas found to increase the concentration of Cl- in paper-contained samples far above what is expected for the spontaneous dissolution of the transducer's AgCl, thereby worsening lower LODs. In addition, for the case of Ag+, the commonly hypothesized adsorption of metal cations onto filter paper was found not to significantly affect the performance of AgCl/Ag transducers. We note that in the context of chemical analysis, metal impurities of paper are often mentioned in the literature, but Cl- contamination of paper has been overlooked.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Prata
/
Cloretos
Tipo de estudo:
Diagnostic_studies
Idioma:
En
Revista:
Anal Chem
Ano de publicação:
2022
Tipo de documento:
Article
País de afiliação:
Estados Unidos